MOT History from tests of petrol PORSCHE 911s year 1979

Review the list of common PORSCHE 911 failures below or to perform a specific mot history check on your PORSCHE then use our popular KnowYourCar service

mot history

Pass percent:74.32%

(The average a petrol PORSCHE 911 year 1979 passes without issue)

Based on:4,046 MOT Tests

Most common failures	No# failures
Headlamp aim out of alignment	341
Rear brake binding	132
Registration plate lamp issues	120
Registration plate issues	90
Parking brake: efficiency below requirements \|3.7.B.7\|	89
Windscreen wiper does not clear the windscreen effectively	80
Horn not working \|1.6.2a\|	69
Brake pipe excessively corroded	66
Exhaust emissions carbon monoxide content excessive \|7.3.B.1a\|	64
Rear parking brake recording little or no effort	64
Brake hose excessively deteriorated	62
Service brake: efficiency below requirements \|3.7.B.7\|	56
Brakes imbalanced across an axle	46
Offside front brake binding \|3.7.B.1\|	36
Nearside front brake binding \|3.7.B.1\|	33
Nearside Stop lamp not working \|1.2.1b\|	24
Nearside Front position lamp\|s\| not working \|1.1.A.3b\|	22
Windscreen washer not working	22
Nearside Front Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	21
Offside Front position lamp\|s\| not working \|1.1.A.3b\|	21
Offside Stop lamp not working \|1.2.1b\|	20
Nearside Headlamp not working on dipped beam \|1.7.5a\|	18
Exhaust has a major leak of exhaust gases \|7.1.2\|	18
Nearside Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	17
Offside Rear position lamp\|s\| excessively deteriorated so that it is not visible from a reasonable distance \|1.1.A.3d\|	17
Offside Headlamp not working on dipped beam \|1.7.5a\|	16
Nearside Headlamp not working on main beam \|1.7.5a\|	16
Mechanical brake component has restricted free movement	16
Nearside Front Direction indicator not working \|1.4.A.2c\|	16
Offside Headlamp not working on main beam \|1.7.5a\|	15
Offside Rear Stop lamp not working \|1.2.1b\|	15
Offside Front Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	15
Offside Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	15
Nearside Rear Direction indicator not working \|1.4.A.2c\|	15
Direction indicators flashing more than 120 times a minute \|1.4.A.2g\|	14
Offside Front Direction indicator not working \|1.4.A.2c\|	14
Exhaust emissions hydrocarbon content excessive \|7.3.B.1b\|	14
Rear Mechanical brake component has restricted free movement	13
Offside Headlamp aim beam image obviously incorrect \|1.8.A.1b\|	13
Nearside Side repeater not working \|1.4.A.2c\|	13
Offside Front front brake binding \|3.7.B.1\|	13
Nearside Rear Stop lamp not working \|1.2.1b\|	12
Nearside Rear Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	12
Offside Headlamp aim beam image kick up to the offside \|1.8\|	12
Offside Front Headlamp not working on dipped beam \|1.7.5a\|	11
Offside Rear Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	11
Direction indicators not working \|1.4.A.2c\|	11
Nearside Rear position lamp\|s\| not working \|1.1.A.3b\|	11
Front passenger door cannot be opened from inside the vehicle \|6.2.B.1b\|	11
Rear Exhaust has a major leak of exhaust gases \|7.1.2\|	11
Steering column top bearing excessively worn \|2.1.2c\|	10
Front brake application uneven	10
Nearside Front front brake binding \|3.7.B.1\|	10
Nearside Rear Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	10
Exhaust emissions carbon monoxide content excessive (8.2.1.2 (b))	9
Nearside Headlamp aim beam image obviously incorrect \|1.8.A.1b\|	9
Nearside Front Front position lamp\|s\| not working \|1.1.A.3b\|	9
Parking brake lever has no reserve travel \|3.1.6b\|	9
Nearside Rear position lamp\|s\| excessively deteriorated so that it is not visible from a reasonable distance \|1.1.A.3d\|	9
Offside Side repeater not working \|1.4.A.2c\|	9
Rear fog lamp not working \|1.3.2b\|	9
Exhaust emissions carbon monoxide content excessive \|8.2.1.2 \|b\|\|	9
Battery insecure \|1.9.1\|	8
Driver`s door cannot be opened from inside the vehicle \|6.2.B.1b\|	8
Front passenger door cannot be opened from outside the vehicle \|6.2.B.1b\|	8
Nearside Front Anti-roll bar has excessive play in a pin/bush \|2.4.G.2\|	8
Nearside Rear position lamp\|s\| adversely affected by the operation of another lamp \|1.1.A.3f\|	8
Horn not loud enough to be heard by another road user \|1.6.2b\|	8
Offside Rear Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	8
Nearside Headlamp aim beam image kick up to the offside \|1.8\|	8
Nearside Front Anti-roll bar rubber bush deteriorated resulting in excessive movement \|2.4.G.2\|	7
Brake hose has insufficient room to move	7
Offside Front wheel bearing has excessive play \|2.5.A.3c\|	7
Offside Rear position lamp\|s\| not working \|1.1.A.3b\|	7
Offside Front Anti-roll bar has excessive play in a pin/bush \|2.4.G.2\|	7
Nearside Front wheel bearing has excessive play \|2.5.A.3c\|	7
Offside Rear Brake hose bulging under pressure \|3.6.B.3\|	7
Brake performance not tested \|3.7.A.1\|	7
Nearside Front Headlamp not working on dipped beam \|1.7.5a\|	6
Parking brake efficiency less than 50% of the required value (1.4.2 (a) (ii))	6
Offside Front Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	6
Hazard warning lamps inoperative \|1.4.B.1b\|	6
Nearside Rear wheel bearing has excessive play \|2.6.2\|	6
Offside Front Direction indicators not working \|1.4.A.2c\|	6
Offside Front Headlamp not working on main beam \|1.7.5a\|	6
Nearside Rear Exhaust has a major leak of exhaust gases \|7.1.2\|	6
Offside Front Headlamp not in good working order adversely affecting beam image \|1.2.4a\|	6
Headlamp switch faulty \|1.7.1\|	6
Offside Rear Direction indicator not working \|1.4.A.2c\|	6
Offside Rear Rear position lamp\|s\| excessively deteriorated so that it is not visible from a reasonable distance \|1.1.A.3d\|	6
Rear brake application uneven	6
Front Windscreen wiper not operating automatically when switched on \|8.2.1b\|	5
Nearside Front brake caliper has restricted free movement \|3.5.1k\|	5
Nearside Front Track rod end ball joint dust cover excessively deteriorated so that it no longer prevents the ingress of dirt \|2.2.C.1c\|	5
Nearside Front Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	5
Offside Front Front position lamp\|s\| not working \|1.1.A.3b\|	5
Parking brake: efficiency below requirements \|3.7.C.1b\|	5
Nearside Front wheel bearing rough when rotated \|2.5.A.2\|	5
Emissions not tested \|7.0\|	5
Nearside Front Direction indicators not working \|1.4.A.2c\|	5
Offside Front Brake hose bulging under pressure \|3.6.B.3\|	5
All position lamps not working \|1.1.A.3b\|	5
Rear position lamp\|s\| excessively deteriorated so that it is not visible from a reasonable distance \|1.1.A.3d\|	5
Offside Front Shock absorber has negligible damping effect \|2.7.5\|	5
Offside Front Body or chassis has excessive corrosion, seriously affecting its strength within 30cm of the body mountings \|6.1.B.2\|	5
Offside Rear Direction indicators not working \|1.4.A.2c\|	5
Service brake efficiency below requirements (1.2.2 (a) (i))	4
Offside Front Anti-roll bar rubber bush deteriorated resulting in excessive movement \|2.4.G.2\|	4
Dipswitch operation does not deflect all main beam headlamps to make them dipped beams \|1.7.4b\|	4
Offside Front Vehicle structure has excessive corrosion which adversely affects braking or steering \|6.1.A.1\|	4
Nearside Rear brake caliper has restricted free movement \|3.5.1k\|	4
Hazard warning switch faulty \|1.4.B.1d\|	4
Fuel cap/sealing device sealing washer deteriorated \|7.2.4c\|	4
Hazard warning lamps not flashing in phase, with ignition off \|1.4.B.1f\|	4
Hazard warning lamps not flashing in phase, with ignition on \|1.4.B.1f\|	4
Offside Front Track rod end ball joint dust cover excessively deteriorated so that it no longer prevents the ingress of dirt \|2.2.C.1c\|	4
Offside Windscreen wiper blade deteriorated \|8.2.2\|	4
An item not tested \|Manual\|	4
Nearside Steering rack gaiter split \|2.2.D.2d\|	4
Offside Steering rack gaiter split \|2.2.D.2d\|	4
Nearside Rear Position lamp not working (4.2.1 (a) (ii))	4
Offside Front Front wheel bearing has excessive play \|2.5.A.3c\|	4
Nearside Front Headlamp not working on main beam \|1.7.5a\|	4
Offside Rear front brake binding \|3.7.B.1\|	4
Offside Rear brake caliper has restricted free movement \|3.5.1k\|	4
Brake pedal spongy \|3.3.B.1b\|	4
Nearside Windscreen wiper blade deteriorated \|8.2.2\|	4
Nearside Rear Rear wheel bearing rough when rotated \|2.6.1\|	4
Parking brake efficiency below requirements (1.4.2 (a) (i))	4
Nearside Rear Body or chassis has excessive corrosion, seriously affecting its strength within 30cm of the body mountings \|6.1.B.2\|	4
Service brake: efficiency below requirements \|3.7.C.1a\|	4
Nearside Front Brake hose bulging under pressure \|3.6.B.3\|	4
Nearside Front Anti-roll bar rubber mounting deteriorated resulting in excessive movement \|2.4.G.2\|	4
Offside Front Anti-roll bar rubber mounting deteriorated resulting in excessive movement \|2.4.G.2\|	4
Offside Front Headlamp aim beam image kick up to the offside \|1.8\|	4
Offside Rear position lamp\|s\| adversely affected by the operation of another lamp \|1.1.A.3f\|	4

We get to these numbers by trawling through over 1 billion MOT test results since 2004 and crunched the numbers. We remove anything to do with Tyres, as they are model independent and group together common non-model specific issues. We are trying to get to a picture of what models have what issues.

Please note: We take the data from the DVSA. This data is raw and can contain typos and spelling mistakes that garages may have entered while recording a MOT result. Specifically miss-match on names of models and makes. We are constantly cleaning the data so bear with the odd issue.

Got suggestions? We’re improving this section all the time. If you have any suggestions, please let us know.

Most common failures	No# failures
Headlamp aim out of alignment	341
Rear brake binding	132
Registration plate lamp issues	120
Registration plate issues	90
Parking brake: efficiency below requirements \|3.7.B.7\|	89
Windscreen wiper does not clear the windscreen effectively	80
Horn not working \|1.6.2a\|	69
Brake pipe excessively corroded	66
Exhaust emissions carbon monoxide content excessive \|7.3.B.1a\|	64
Rear parking brake recording little or no effort	64
Brake hose excessively deteriorated	62
Service brake: efficiency below requirements \|3.7.B.7\|	56
Brakes imbalanced across an axle	46
Offside front brake binding \|3.7.B.1\|	36
Nearside front brake binding \|3.7.B.1\|	33
Nearside Stop lamp not working \|1.2.1b\|	24
Nearside Front position lamp\|s\| not working \|1.1.A.3b\|	22
Windscreen washer not working	22
Nearside Front Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	21
Offside Front position lamp\|s\| not working \|1.1.A.3b\|	21
Offside Stop lamp not working \|1.2.1b\|	20
Nearside Headlamp not working on dipped beam \|1.7.5a\|	18
Exhaust has a major leak of exhaust gases \|7.1.2\|	18
Nearside Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	17
Offside Rear position lamp\|s\| excessively deteriorated so that it is not visible from a reasonable distance \|1.1.A.3d\|	17
Offside Headlamp not working on dipped beam \|1.7.5a\|	16
Nearside Headlamp not working on main beam \|1.7.5a\|	16
Mechanical brake component has restricted free movement	16
Nearside Front Direction indicator not working \|1.4.A.2c\|	16
Offside Headlamp not working on main beam \|1.7.5a\|	15
Offside Rear Stop lamp not working \|1.2.1b\|	15
Offside Front Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	15
Offside Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	15
Nearside Rear Direction indicator not working \|1.4.A.2c\|	15
Direction indicators flashing more than 120 times a minute \|1.4.A.2g\|	14
Offside Front Direction indicator not working \|1.4.A.2c\|	14
Exhaust emissions hydrocarbon content excessive \|7.3.B.1b\|	14
Rear Mechanical brake component has restricted free movement	13
Offside Headlamp aim beam image obviously incorrect \|1.8.A.1b\|	13
Nearside Side repeater not working \|1.4.A.2c\|	13
Offside Front front brake binding \|3.7.B.1\|	13
Nearside Rear Stop lamp not working \|1.2.1b\|	12
Nearside Rear Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	12
Offside Headlamp aim beam image kick up to the offside \|1.8\|	12
Offside Front Headlamp not working on dipped beam \|1.7.5a\|	11
Offside Rear Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	11
Direction indicators not working \|1.4.A.2c\|	11
Nearside Rear position lamp\|s\| not working \|1.1.A.3b\|	11
Front passenger door cannot be opened from inside the vehicle \|6.2.B.1b\|	11
Rear Exhaust has a major leak of exhaust gases \|7.1.2\|	11
Steering column top bearing excessively worn \|2.1.2c\|	10
Front brake application uneven	10
Nearside Front front brake binding \|3.7.B.1\|	10
Nearside Rear Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	10
Exhaust emissions carbon monoxide content excessive (8.2.1.2 (b))	9
Nearside Headlamp aim beam image obviously incorrect \|1.8.A.1b\|	9
Nearside Front Front position lamp\|s\| not working \|1.1.A.3b\|	9
Parking brake lever has no reserve travel \|3.1.6b\|	9
Nearside Rear position lamp\|s\| excessively deteriorated so that it is not visible from a reasonable distance \|1.1.A.3d\|	9
Offside Side repeater not working \|1.4.A.2c\|	9
Rear fog lamp not working \|1.3.2b\|	9
Exhaust emissions carbon monoxide content excessive \|8.2.1.2 \|b\|\|	9
Battery insecure \|1.9.1\|	8
Driver`s door cannot be opened from inside the vehicle \|6.2.B.1b\|	8
Front passenger door cannot be opened from outside the vehicle \|6.2.B.1b\|	8
Nearside Front Anti-roll bar has excessive play in a pin/bush \|2.4.G.2\|	8
Nearside Rear position lamp\|s\| adversely affected by the operation of another lamp \|1.1.A.3f\|	8
Horn not loud enough to be heard by another road user \|1.6.2b\|	8
Offside Rear Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	8
Nearside Headlamp aim beam image kick up to the offside \|1.8\|	8
Nearside Front Anti-roll bar rubber bush deteriorated resulting in excessive movement \|2.4.G.2\|	7
Brake hose has insufficient room to move	7
Offside Front wheel bearing has excessive play \|2.5.A.3c\|	7
Offside Rear position lamp\|s\| not working \|1.1.A.3b\|	7
Offside Front Anti-roll bar has excessive play in a pin/bush \|2.4.G.2\|	7
Nearside Front wheel bearing has excessive play \|2.5.A.3c\|	7
Offside Rear Brake hose bulging under pressure \|3.6.B.3\|	7
Brake performance not tested \|3.7.A.1\|	7
Nearside Front Headlamp not working on dipped beam \|1.7.5a\|	6
Parking brake efficiency less than 50% of the required value (1.4.2 (a) (ii))	6
Offside Front Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	6
Hazard warning lamps inoperative \|1.4.B.1b\|	6
Nearside Rear wheel bearing has excessive play \|2.6.2\|	6
Offside Front Direction indicators not working \|1.4.A.2c\|	6
Offside Front Headlamp not working on main beam \|1.7.5a\|	6
Nearside Rear Exhaust has a major leak of exhaust gases \|7.1.2\|	6
Offside Front Headlamp not in good working order adversely affecting beam image \|1.2.4a\|	6
Headlamp switch faulty \|1.7.1\|	6
Offside Rear Direction indicator not working \|1.4.A.2c\|	6
Offside Rear Rear position lamp\|s\| excessively deteriorated so that it is not visible from a reasonable distance \|1.1.A.3d\|	6
Rear brake application uneven	6
Front Windscreen wiper not operating automatically when switched on \|8.2.1b\|	5
Nearside Front brake caliper has restricted free movement \|3.5.1k\|	5
Nearside Front Track rod end ball joint dust cover excessively deteriorated so that it no longer prevents the ingress of dirt \|2.2.C.1c\|	5
Nearside Front Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	5
Offside Front Front position lamp\|s\| not working \|1.1.A.3b\|	5
Parking brake: efficiency below requirements \|3.7.C.1b\|	5
Nearside Front wheel bearing rough when rotated \|2.5.A.2\|	5
Emissions not tested \|7.0\|	5
Nearside Front Direction indicators not working \|1.4.A.2c\|	5
Offside Front Brake hose bulging under pressure \|3.6.B.3\|	5
All position lamps not working \|1.1.A.3b\|	5
Rear position lamp\|s\| excessively deteriorated so that it is not visible from a reasonable distance \|1.1.A.3d\|	5
Offside Front Shock absorber has negligible damping effect \|2.7.5\|	5
Offside Front Body or chassis has excessive corrosion, seriously affecting its strength within 30cm of the body mountings \|6.1.B.2\|	5
Offside Rear Direction indicators not working \|1.4.A.2c\|	5
Service brake efficiency below requirements (1.2.2 (a) (i))	4
Offside Front Anti-roll bar rubber bush deteriorated resulting in excessive movement \|2.4.G.2\|	4
Dipswitch operation does not deflect all main beam headlamps to make them dipped beams \|1.7.4b\|	4
Offside Front Vehicle structure has excessive corrosion which adversely affects braking or steering \|6.1.A.1\|	4
Nearside Rear brake caliper has restricted free movement \|3.5.1k\|	4
Hazard warning switch faulty \|1.4.B.1d\|	4
Fuel cap/sealing device sealing washer deteriorated \|7.2.4c\|	4
Hazard warning lamps not flashing in phase, with ignition off \|1.4.B.1f\|	4
Hazard warning lamps not flashing in phase, with ignition on \|1.4.B.1f\|	4
Offside Front Track rod end ball joint dust cover excessively deteriorated so that it no longer prevents the ingress of dirt \|2.2.C.1c\|	4
Offside Windscreen wiper blade deteriorated \|8.2.2\|	4
An item not tested \|Manual\|	4
Nearside Steering rack gaiter split \|2.2.D.2d\|	4
Offside Steering rack gaiter split \|2.2.D.2d\|	4
Nearside Rear Position lamp not working (4.2.1 (a) (ii))	4
Offside Front Front wheel bearing has excessive play \|2.5.A.3c\|	4
Nearside Front Headlamp not working on main beam \|1.7.5a\|	4
Offside Rear front brake binding \|3.7.B.1\|	4
Offside Rear brake caliper has restricted free movement \|3.5.1k\|	4
Brake pedal spongy \|3.3.B.1b\|	4
Nearside Windscreen wiper blade deteriorated \|8.2.2\|	4
Nearside Rear Rear wheel bearing rough when rotated \|2.6.1\|	4
Parking brake efficiency below requirements (1.4.2 (a) (i))	4
Nearside Rear Body or chassis has excessive corrosion, seriously affecting its strength within 30cm of the body mountings \|6.1.B.2\|	4
Service brake: efficiency below requirements \|3.7.C.1a\|	4
Nearside Front Brake hose bulging under pressure \|3.6.B.3\|	4
Nearside Front Anti-roll bar rubber mounting deteriorated resulting in excessive movement \|2.4.G.2\|	4
Offside Front Anti-roll bar rubber mounting deteriorated resulting in excessive movement \|2.4.G.2\|	4
Offside Front Headlamp aim beam image kick up to the offside \|1.8\|	4
Offside Rear position lamp\|s\| adversely affected by the operation of another lamp \|1.1.A.3f\|	4

MOT History from tests of petrol PORSCHE 911s year 1979

Find us on Facebook